The Q&A Archives: spider stains on vinyl siding

Question: what product is best for removing spider dropping stains and whether to use power washer or not

Answer: According to one of the largest Vinyl siding manufactures (CertainTeed), the following recommendations should help:
1. For stubborn stains cleaners like Fantastic, formula 409, and simple green are their recommendations.
2. When cleaning siding work from the bottom up to reduce streaking.
3. If mildew is also present they recommend commercially available cleaners.
4. For the homeowners who wish to mix their own they recommend the following:
a. 3 quarts water
b. 1 quart household bleach.
c. 1/3 cup powdered laundry detergent
d. 2/3 cup TSP
Be sure to rinse the cleaner off with fresh water.

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